<template>
  <view class="uni-combox" :class="border ? '' : 'uni-combox__no-border'">
    <view v-if="label" class="uni-combox__label" :style="labelStyle">
      <text>{{ label }}</text>
    </view>
    <view class="uni-combox__input-box">
      <input
        class="uni-combox__input"
        type="text"
        :placeholder="placeholder"
        placeholder-class="uni-combox__input-plac"
        v-model="inputVal"
        @input="onInput"
        @focus="onFocus"
        @blur="onBlur"
        ref="minput"
        :focus="isFocus"
      />
      <uni-icons
        :type="showSelector ? 'top' : 'bottom'"
        size="14"
        color="#999"
        @click="toggleSelector"
      >
      </uni-icons>
    </view>
    <view class="uni-combox__selector" v-if="showSelector">
      <view class="uni-popper__arrow"></view>
      <scroll-view scroll-y="true" class="uni-combox__selector-scroll">
        <view
          class="uni-combox__selector-empty"
          v-if="filterCandidatesLength === 0"
        >
          <text>{{ emptyTips }}</text>
        </view>
        <view
          class="uni-combox__selector-item"
          v-for="(item, index) in filterCandidates"
          :key="index"
          @click="onSelectorClick(index)"
          :class="{ slected: inputVal.includes(item) }"
        >
          <text>{{ item }}</text>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
/**
 * Combox 组合输入框
 * @description 组合输入框一般用于既可以输入也可以选择的场景
 * @tutorial https://ext.dcloud.net.cn/plugin?id=1261
 * @property {String} label 左侧文字
 * @property {String} labelWidth 左侧内容宽度
 * @property {String} placeholder 输入框占位符
 * @property {Array} candidates 候选项列表
 * @property {String} emptyTips 筛选结果为空时显示的文字
 * @property {String} value 组合框的值
 */
export default {
  name: "uniCombox",
  emits: ["input", "update:modelValue", "change"],
  props: {
    border: {
      type: Boolean,
      default: true,
    },
    label: {
      type: String,
      default: "",
    },
    labelWidth: {
      type: String,
      default: "auto",
    },
    placeholder: {
      type: String,
      default: "",
    },
    candidates: {
      type: Array,
      default() {
        return [];
      },
    },
    emptyTips: {
      type: String,
      default: "无匹配项",
    },
    // #ifndef VUE3
    value: {
      type: [String, Number],
      default: "",
    },
    // #endif
    // #ifdef VUE3
    modelValue: {
      type: [String, Number, Array],
      default: "",
    },
    // #endif
  },
  data() {
    return {
      showSelector: false,
      inputVal: "",
      selectedList: [],
      isFocus: false,
    };
  },
  computed: {
    labelStyle() {
      if (this.labelWidth === "auto") {
        return "";
      }
      return `width: ${this.labelWidth}`;
    },
    filterCandidates() {
      return this.candidates;
      // 	.filter((item) => {
      //   return item.toString().indexOf(this.inputVal) > -1;
      // });
    },
    filterCandidatesLength() {
      return this.filterCandidates.length;
    },
  },
  watch: {
    // #ifndef VUE3
    value: {
      handler(newVal) {
        this.inputVal = newVal || "";
      },
      immediate: true,
    },
    // #endif
    // #ifdef VUE3
    modelValue: {
      handler(newVal) {
        if (newVal) {
          this.inputVal = newVal instanceof Array ? newVal.join(",") : newVal;
        } else {
          this.inputVal = "";
        }
      },
      immediate: true,
    },
    // #endif
  },
  methods: {
    toggleSelector() {
      this.showSelector = !this.showSelector;
    },
    onFocus() {
      this.showSelector = true;
    },
    onBlur() {
      // setTimeout(() => {
      //   if (this.isFocus) {
      //     this.showSelector = true;
      //     this.isFocus = false;
      //   } else {
      //     this.showSelector = false;
      //     this.isFocus = false;
      //   }
      // }, 0);
    },
    onSelectorClick(index) {
      if (this.inputVal.includes(this.filterCandidates[index])) {
        return;
      }
      this.selectedList.push(this.filterCandidates[index]);
      if (!this.inputVal) {
        this.inputVal = this.filterCandidates[index];
      } else {
        this.inputVal += `,${this.filterCandidates[index]}`;
      }
      this.$emit("input", this.inputVal);
      this.$emit("update:modelValue", this.inputVal);
      this.$emit("change", this.inputVal);
      setTimeout(() => {
        this.isFocus = true;
      }, 10);
      // console.log(this.$refs.minput);
      // this.$refs.minput.focus = true;
    },
    onInput() {
      setTimeout(() => {
        this.selectedList = this.filterCandidates.filter((item) =>
          this.inputVal.includes(item)
        );
        this.$emit("input", this.inputVal);
        this.$emit("update:modelValue", this.inputVal);
        this.$emit("change", this.inputVal);
      });
    },
  },
};
</script>

<style lang="scss" scoped>
.uni-combox {
  font-size: 14px;
  border: 1px solid #dcdfe6;
  border-radius: 4px;
  padding: 6px 10px;
  position: relative;
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  // height: 40px;
  flex-direction: row;
  align-items: center;
  // border-bottom: solid 1px #DDDDDD;
}

.uni-combox__label {
  font-size: 16px;
  line-height: 22px;
  padding-right: 10px;
  color: #999999;
}

.uni-combox__input-box {
  position: relative;
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  flex: 1;
  flex-direction: row;
  align-items: center;
}

.uni-combox__input {
  flex: 1;
  font-size: 14px;
  height: 22px;
  line-height: 22px;
}

.uni-combox__input-plac {
  font-size: 14px;
  color: #999;
}

.uni-combox__selector {
  /* #ifndef APP-NVUE */
  box-sizing: border-box;
  /* #endif */
  position: absolute;
  top: calc(100% + 12px);
  left: 0;
  width: 100%;
  background-color: #ffffff;
  border: 1px solid #ebeef5;
  border-radius: 6px;
  box-shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.1);
  z-index: 2;
  padding: 4px 0;
}

.uni-combox__selector-scroll {
  /* #ifndef APP-NVUE */
  max-height: 200px;
  box-sizing: border-box;
  /* #endif */
}

.uni-combox__selector-empty,
.uni-combox__selector-item {
  /* #ifndef APP-NVUE */
  display: flex;
  cursor: pointer;
  /* #endif */
  line-height: 36px;
  font-size: 14px;
  text-align: center;
  // border-bottom: solid 1px #DDDDDD;
  padding: 0px 10px;
}

.uni-combox__selector-item:hover {
  background-color: #f9f9f9;
}

.uni-combox__selector-empty:last-child,
.uni-combox__selector-item:last-child {
  /* #ifndef APP-NVUE */
  border-bottom: none;
  /* #endif */
}

// picker 弹出层通用的指示小三角
.uni-popper__arrow,
.uni-popper__arrow::after {
  position: absolute;
  display: block;
  width: 0;
  height: 0;
  border-color: transparent;
  border-style: solid;
  border-width: 6px;
}

.uni-popper__arrow {
  filter: drop-shadow(0 2px 12px rgba(0, 0, 0, 0.03));
  top: -6px;
  left: 10%;
  margin-right: 3px;
  border-top-width: 0;
  border-bottom-color: #ebeef5;
}

.uni-popper__arrow::after {
  content: " ";
  top: 1px;
  margin-left: -6px;
  border-top-width: 0;
  border-bottom-color: #fff;
}

.uni-combox__no-border {
  border: none;
}
.slected {
  color: royalblue;
}
</style>
